Visual Regression Testing

What is Visual Regression Testing?

Visual regression testing captures screenshots of the interface and compares them pixel-by-pixel (or region-by-region) against approved baselines, flagging any unexpected visual difference for review. It catches the class of defects that functional assertions miss entirely—misaligned layouts, wrong colors, broken styling, overlapping elements—that only the eye notices. Effective visual testing depends on careful baseline management so legitimate design changes are accepted deliberately. Combined with functional flow tests, it ensures a page is not only correct in behavior but also correct in appearance.